/**
 * 
 */
package com.example.sjt.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpMethod;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import com.example.sjt.JWTAuthenticationEntryPoint;
import com.example.sjt.filter.JWTAuthenticationFilter;
import com.example.sjt.filter.JWTAuthorizationFilter;

/**
 * @author yuqy
 *
 */
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

	@Autowired
	@Qualifier("userDetailsServiceImpl")
	private UserDetailsService userDetailsService;

	@Bean
	public BCryptPasswordEncoder bCryptPasswordEncoder() {
		return new BCryptPasswordEncoder();
	}

	@Override
	protected void configure(AuthenticationManagerBuilder auth) throws Exception {
		auth.userDetailsService(userDetailsService).passwordEncoder(bCryptPasswordEncoder());
	}

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http.cors().and().csrf().disable().authorizeRequests()
				// 测试用资源，需要验证了的用户才能访问
				.antMatchers("/tasks/**").authenticated().antMatchers(HttpMethod.DELETE, "/tasks/**").hasRole("ADMIN")
				// 其他都放行了
				.anyRequest().permitAll().and().addFilter(new JWTAuthenticationFilter(authenticationManager())).addFilter(new JWTAuthorizationFilter(authenticationManager()))
				// 不需要session
				.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and().exceptionHandling().authenticationEntryPoint(new JWTAuthenticationEntryPoint());
	}

	@Bean
	CorsConfigurationSource corsConfigurationSource() {
		final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
		source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues());
		return source;
	}

}
